1. D. Bohm, in Characteristics of Electrical Discharges in Magnetic Fields, Ed. by A. Guthrie and R. K. Wakerling (McGraw-Hill, New York, Toronto, London, 1949).
2. O. V. Kozlov, Electrical Probe in Plasma (Atomizdat, Moscow, 1969), p. 20 [in Russian].
3. P. E. Masherov, V. A. Riaby, and V. A. Godyak, Rev. Sci. Instrum. 87, 02B926 (2016).
4. VGPS Probe System. www.plasmasensors.com.
5. V. A. Godyak and V. I. Demidov, J. Phys. D: Appl. Phys. 44, 233001 (2011).